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#1
11-21-2018, 06:29 PM
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First roundy I did was like that...Bugged the ARF folks, wracked my brain, gave up for a while then pulled the shorted (since previous test) damper out to put in another set that had an intermittent damper short that was causing flickering and that set went dead...Then I quickly went from stalled to all wheels turning full speed/completed resto.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 
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#2
07-10-2019, 12:37 PM
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Okay, well, I'm back with a new problem.
After using this without problem for a few months, I suddenly starting having some bizarre intermittent issues with the picture and audio. It would run fine for awhile, then suddenly the entire set would have this dip where the picture would become blurry and dim and the audio would hum, and then it would pop back to normal. It kept doing this on and off every 20 seconds or so. I switched it off, fiddled with the antenna and all that, and eventually got it working fine by plugging it directly into the wall instead of using it on a power strip. So, okay, maybe that's the problem? Except then it started up again. Same issue, and it's gotten worse. When I unplug the converter box and antenna, I'm getting a sort of grainy, lit screen, but there's no "snow" if that makes sense. At this point, it's doing it all the time on power up. Here's a video of what it looks and sounds like as of today: https://www.youtube.com/watch?v=1joh...ature=youtu.be I have a couple theories. First, I ordered a few new tubes for the tuner. I'm thinking I may have a dying RF amp tube, but that's just a wild guess. I suppose it could also be a weak mixer/oscillator. Whatever the problem is, it has to be before the audio and video are separated. I'm also wondering if there isn't a wiring problem in the wall, since it got better before when I switched to a direct connection. I'm going to try moving to a different location and seeing if that improves things. If it does, I may be looking at a house problem and not a television problem. If anyone has any theories on what this looks like, though, please let me know. I'm a bit stumped by the fact that, at least before today, it would be fine for awhile before suddenly doing this. Seems like a heating problem, which is why I'm saying tube, but I'm no expert.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#3
07-10-2019, 12:45 PM
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Okay, same problem, but I was able to capture the intermittent nature this time.
One thing I forgot to mention is that tapping near the tuner seems to impact it. I didn't capture that part effectively, but it went from normal static visual and audio to everything cutting in and out maybe ever 20 seconds. Then I tapped the cabinet near the tuner and it started cutting in and out much faster. Loose connection somewhere, maybe? Anyway, here's the video: https://www.youtube.com/watch?v=yXLR...ature=youtu.be I may see about pulling the back off and reseating the tubes at least. Not sure if that'll do much or not, but I suppose it can't hurt.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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